Which behavior by the client exhibits denial after a recent diagnosis?

The correct answer is 'Attempts to minimize the illness.' This behavior is a classic sign of denial, where the individual tries to downplay the seriousness of the illness to cope with it. By minimizing the illness, the client avoids facing the reality of the situation, which is characteristic of denial. Lacking an emotional response to the illness suggests suppression of emotions rather than denial. Refusing to discuss the condition with the spouse may stem from other issues like relationship strain or fear of causing distress, but it doesn't directly indicate denial. Expressing displeasure with the prescribed activity program typically reflects displaced anger, not denial of the illness.